clearvars function in simulink function block

The function in a simulink function block calls another function which has an instruction given below:

clearvars -global Downsample DATAPADDING_MSECS SEARCHBUFFER Fs WHOLE_SIGNAL Align_Nfft Window

This function is giving an error:

Function 'clearvars' not supported for code generation.

I have used

coder.extrinsic("clearvars");

But the error persists, what should I do?

Answer 1

[Shivam Gothi]

Hello @Sania Gul,

I am not familiar with the specific structure of your Simulink model, but I wanted to share some information from the following documentation

https://www.mathworks.com/help/coder/ref/coder.extrinsic.html

According to it, The code generation is not supported for "extrinsic" functions. The code generator does not produce code for the body of the extrinsic function and instead uses the MATLAB® engine to execute the call.

The line:

coder.extrinsic("function1");

will make "function1" an extrinsic function.

I think that the presence of extrinsic function in your model is not allowing code generation for your simulink model.

You can also refer to the below documentation to know more about extrinsic functions and their uses in MATLAB.

https://www.mathworks.com/help/simulink/ug/use-matlab-engine-to-execute-a-function-call-in-generated-code.html

[Sania Gul]

Tnx a lot. :-)

Answer 2

[Walter Roberson]

Compiled models use static allocation for global variables. Asking to clear the global would be asking to release the static memory. This is unlikely to make the memory available for use, as the allocations for dynamic memory would be a different part of the address space.

[Sania Gul]

Ok. What I understand is that deleted the variables declared as global is not possible. Hopefully I m right. TNk u sooooo much, for resolving the confusion.